Medium Disc Filing Means and Disc Storage Means Incorporating Same

ABSTRACT

A medium disc filing means comprises a filing rail ( 20 ) and a plurality of detachable disc holders ( 30 ), the filing rail comprises a rail body and a pair of transversally protruding flanges ( 21,22 ), each disc holder comprises an attachment member and a medium disc receptacle, the attachment member comprises a clipping aperture ( 37 ) which is resiliently deformable so that the clipping aperture can be deformed to overcome the transversal width of the pair of flanges when a disc holder is to be attached to or detached from the filing rail. Such a filing means provides improved reliability and convenience since medium discs can be placed at selective locations on the filing rail and a filing order can be reasonably maintained due to clipping engagement between the filing rail and the disc holders.

FIELD OF THE INVENTION

This invention relates to filing means for medium discs and, moreparticularly, to means, devices and apparatus for filing opticallyreadable medium discs, such as CDs. This invention also relates tomedium disc storage means incorporating such filing means.

BACKGROUND OF THE INVENTION

Medium discs, especially optically readable medium discs such as CDs, CDROMs, CD RAV, MDs, DVDs, VCDs, are widely used in information technologyand multi-media applications for information storage. Optically readablemedium discs (in short “optical discs”) are advantageous because oftheir high data density, their reliability, their robustness as well astheir being compact and slim. Due to the versatility of optical discs,they are used in many applications and there is a practical need toprovide more efficient and useful filing means so that a large number ofinformation carrying optical discs can be stored in a relatively smallstorage space and can be carried around relatively easily.

Jewel—or other boxes are widely used for storing medium discs. However,they are not space efficient since the thickness of a jewel box is manytimes that of the medium disc itself. In additional, Jewel boxes areusually stored on shelving units such as CD-racks and such shelf-typefiling and storage systems are bulky. More space efficient medium discstorage means such as the envelope-type, the sleeve-type and otherflexible pocket-type storage means have been increasingly used foroptical discs storage and filing. Typically, an information-carryingmedium disc is placed inside a pocket-type storage means. A number of sopocketed medium discs are loosely placed inside a disc drawer or arebound together by a ring-clip type system. When a drawer containing alarge number of information carrying optical discs is carried around ortransported for some distance, it is very likely that the optical discsare randomly shuffled and displaced so that re-filing or re-organizationwould be necessary. Reorganization of the medium discs may mean removalof all discs from the drawer which can be an exhaustive and timeconsuming exercise. On the other hand, when pocketed discs are filedusing the ring-clip system, the optical discs have to be sequentiallyaccessed and re-arrangement of the discs would usually involve therepetitive steps of opening of the ring clip, removal of a disc and thenreplacing the disc to another selected location. Hence, it will bedesirable if a more user friendly and efficient filing means can beprovided.

OBJECT OF THE INVENTION

Accordingly, it is an object of the present invention to provide means,devices and apparatus for more conveniently filing and retrieving mediumdiscs while alleviating aforementioned shortcomings of conventionalmedium disc filing means. More specifically, it is an object, althoughnot an exclusive one, of this invention to provide means, devices andapparatus for filing medium discs with enhanced disc filing andretrieval flexibility while maintaining a reasonable degree of filingrobustness so that medium discs will maintain in good filing orderduring transportation. At a minimum, it is an object of this inventionto provide the public with a useful choice of medium disc filing andstorage means, devices and apparatus.

SUMMARY OF THE INVENTION

According to a preferred embodiment of the present invention, there isprovided a medium disc filing means comprises a filing rail and aplurality of detachable disc holders, the filing rail comprises a railbody and a pair of transversally protruding flanges, each disc holdercomprises an attachment member and a medium disc receptacle, the discreceptacle is attached to one side of the attachment member, the otherside of the attachment member which is not attached to the discreceptacle comprises a clipping aperture for detachably attaching thedisc holder to the filing rail, the clipping aperture is resilientlydeformable so that it can be deformed to overcome the transversal widthof the pair of flanges so that the disc holder can be attached to ordetached from the filing rail. Such a filing means provides improvedreliability and convenience since medium discs can be placed atselective locations on the filing rail and a filing order can bereasonably maintained due to clipping engagement between the filing railand the disc holders.

In a preferred embodiment, the clipping aperture comprises an entryaperture and a latching aperture, the latching aperture is intermediatethe entry aperture and the disc pocket and is in communication with theentry aperture, the entry aperture is narrower than the transversalwidth of the filing rail, the latching aperture is wider than the entryaperture and is adapted for bracketing the transversal ends of thefiling rail.

More particularly, the clipping aperture may comprise a pair ofoppositely facing teeth which protrude away from the attachment member,the free ends of the pair of oppositely facing teeth define the entryaperture and the portions of the teeth between the free ends and theattachment member defines the latching aperture. A pair of protrudingteeth with a curvature concaving towards each other forms an efficientclipping aperture for maintaining a disc holder on the filing rail andis suitable for fast snap clipping.

Preferably, each of the flanges has a rounded outer edge and each ofprotruding teeth comprises an arcuate indentation intermediate its freeend and the attachment member and facing the other opposite tooth, thecorresponding arcuate portions of the pair of protruding teeth togetherforms a latching aperture with arcuate transversal ends. The attachmentmember can be made of durable plastics with the teeth integrally mouldedthereon as a convenient example. The resilient deformability of durableplastics ensures easy clipping and removal.

To facilitate easy removal of a disc from the disc receptacle, themedium disc receptacle comprises an aperture through which a medium discis inserted or removed, the aperture being opposite the filing rail sothat a medium disc can be inserted or removed from above the rail.

In a preferred example, the medium disc receptacle comprises a discpocket with a substantially circular profile and dimensioned to receivea medium disc to be placed inside the disc pocket, the attachment memberis attached to a minor outer circumferential portion of the pocket.

Preferably, the side of the attachment member which is attached to thedisc pocket comprises an arcuate rim portion, the arcuate rim portion isshaped and dimensioned to support a circumferential portion of a mediumdisc when the medium disc is inserted inside the disc pocket duringnormal use so that said disc rests on said attachment member.

Preferably, the disc pocket is flexible and comprises a transparentwindow with a opaque back-sheet, a radially extending aperture isprovided on the transparent window to allow finger access to a mediumdisc being formed on the transparent window to facilitate removal of amedium disc from said pocket.

In an example, the filing rail comprises a concave portion which isintermediate the pair of flanges, the side of the attachment memberwhich is adapted for clipping on to the filing rail comprises a convexportion which is shaped to correspond to the curvature of the concaveportion of the filing rail.

In one perspective, the attachment member comprises an attachment clipwhich comprises a clipping aperture with a pair of opposing catchesdefining the clipping aperture between them, the catches are disposed atthe transversal ends of the clipping aperture and are adapted forclipping on the flanges of the filing rail transversally in a snap-onmanner. For example, each of the opposing catches comprises a curvedhook, the curved hooks of the opposing catches curve towards each otherto form the clipping aperture.

For easy clipping, each of the flange is provided with a rounded outeredge, the curvature of each of the curved hook of said catchsubstantially follows the curvature of the rounded outer edge of theflange.

In an example, the medium disc receptacle comprises a disc pocket with asubstantially circular profile and dimensioned to receive a medium discto be placed inside the disc pocket, the attachment member comprises amain body with an arcuate profile and with the opposing catchesprotruding from the main body to form the clipping aperture, the mainbody comprises two moulded plastic pieces which are fastened together ina back-to-back manner with a minor circumferential portion of the discpocket sandwiched between the moulded plastic pieces to hold the discpocket.

Conveniently, the opposing catches are integrally moulded on one of themoulded pieces, the spacing between the catches is adapted to allow theattachment member to slide along the rail when the disc holder has beenattached on the rail. Likewise, the disc pocket comprises an aperturewhich is adapted for insertion or removal of a medium disc from the discpocket, the aperture being diametrically opposite to the attachmentclip.

Preferably, the pair of opposing catches is disposed so that they arecoplanar and the distance between the opposite approaching ends is lessthan the width of the filing rail, the pair of opposing catches beingresiliently deformable and can be forced apart upon engaging anddisengaging from the filing rail.

In an exemplary application, the disc holder is detachably clipped onthe filing rail with the disc holder immediately above the filing rail,the catch comprises a curved hook, the curvature of the hooksubstantially follows that of the flange and the pair of hooks clamp onthe underside of the flanges, whereby the disc holder is slidable alongthe filing rail but is restrained from detaching from the filing rail.

Of course, the disc holder may comprise a pair of back-to-back discpockets each having a transparent window and sharing a common opaqueback sheet, the disc holder can swing between first and secondinclination planes relative to a transversal orthogonal plane of thefiling rail so that information appearing on medium discs stored in thedisc pockets can be viewed, the extent of swinging of the disc holderbeing co-operatively defined by the curved hooks and the flanges.

In another aspect of this invention, there is described a medium discstorage means which comprises medium disc filing means described in thisspecification in which the storage means further comprises a re-closableenclosure surrounding the medium disc filing means. The re-closableenclosure may comprise a flexible and generally cylindrical body with alongitudinally extending zip. This feature facilitates enhancedportability of the storage means. In addition, the enclosure may furthercomprise a flexible handle which extends longitudinally.

In yet another aspect of this invention, there is described a mediumdisc holder adapted for attaching to a filing rail, comprising a discpocket and an attachment, the attachment clip comprises a pair ofopposing catches defining a clipping aperture between them, the catchesare disposed at the transversal ends of the clipping aperture and areadapted for snap-type clipping on the filing rail, the pair of oppositecatches are adapted so that the disc holder can slide along the filingrail, one side of the attachment member is attached to the disc pocketand the clipping aperture is formed on the other side, the clippingaperture is adapted so that the disc holder can slide along the filingrail so that its longitudinal clipping location can be changed by auser, wherein, the disc holder is adapted so that a medium disc is heldabove the filing rail during normal use.

Similarly, each of the opposing catches may comprise a curved hook, thecurved hooks of the opposing catches curving towards each other and areadapted to catch the filing rail between them. Also, the attachmentmember may comprise a main body and the opposing catches protrude fromsaid main body to form the clipping aperture, the main body beingarcuate and comprising two moulded pieces which are fastened togetherwith a minor circumferential portion of the disc pocket sandwichedbetween the moulded pieces to hold the disc pocket.

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred embodiments of the present invention will be explained infurther detail below by way of examples and with reference to theaccompanying drawings, in which:—

FIG. 1 shows a top perspective view of a preferred embodiment of amedium disc filing means of the present invention,

FIG. 2 is a side view taken from a lateral side of the filing rail ofthe disc filing means of the preferred embodiment of FIG. 1 with aplurality of detachable disc holders being clipped on the filing rail,

FIG. 3 is a top perspective view showing the embodiment of disc FIG. 1with the disc holder and the filing rail detached,

FIG. 4A is a side view of the embodiment of FIG. 1 taken from onelongitudinal end of the filing rail,

FIG. 4B shows the side view of FIG. 4A with the attachment clippartially clipped on the flange of the filing rail and the other side ofthe attachment member moving towards the other longitudinal flange ofthe filing rail for clamping engagement,

FIG. 4C is a side view showing a cross-section of the rail and the sideview of a disc holder when the attachment clip is clipped on the filingrail during normal use conditions,

FIG. 4D shows an exemplary disc holder of the present inventionapproaching the other lateral side of the filing rail for engagementclipping,

FIG. 4E shows the disc holder of FIG. 4D in partially clipped modeduring transition to fully clipped mode,

FIG. 5 shows a transversal cross-section of a preferred embodiment of amedium disc storage container incorporating an exemplary embodiment of adisc filing means of the present invention,

FIG. 6 shows a side view of the disc storage container of FIG. 5 withthe enclosure opened and reviewing a disc holder,

FIG. 7 shows a top view of the opened disc storage container and showinga plurality of disc holders being clipped on the rail,

FIG. 8 is a perspective view showing the disc storage container of FIG.6 and a plurality of disc holders,

FIG. 9 is a transversal cross-section of the disc storage container ofFIG. 6,

FIG. 10 shows the storage container of FIG. 6 in the fully closed orzipped configuration,

FIG. 11 is a top side view of the storage container of FIG. 10,

FIG. 12 is a bottom view of the disc storage container of FIG. 11,

FIG. 13 is a perspective view of the disc storage container of FIG. 11.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring firstly to FIGS. 1 to 4E, there is shown a first preferredembodiment of a medium disc filing means 10 of this invention. The discfiling means comprises a filing rail 20 and a plurality of disc holders30 (although only a single disc holder is shown in some of the Figuresfor convenience). The filing rail comprises an elongated body with apair of longitudinally extending flanges 21, 22. Each of the flanges 21,22 protrudes transversally from the body of the filing rail and has arounded outer edge. The filing rail 20 is made of durable plastics andthe pair of flanges 21 and 22 are integrally moulded to the top lateralsides of the filing rail. Of course, the filing rail and the flanges canbe formed from metal by, for example, metal stamping. Stopping means 23are disposed at the longitudinal ends of the filing rail so that a discholder clipped on the rail can slide on the rail and between theboundary defined by the stopping means. In this example, the filing railhas a substantially uniform cross-section along its length so that adisc holder attached to the filing rail can slide along the length ofthe filing rail. Of course, graduations may be formed on the filing railto define discrete disc storage locations.

A plurality of fastener-receiving apertures 24 for fastening the filingrail to the base of a disc storage container or disc filing shelf aredistributed along the length of the filing rail. The fastener-receivingapertures 24 are formed at depressions 25 moulded along the length ofthe filing rail so that fasteners for attaching the rail to a supportingbase will not obstruct the sliding movement of the disc holders whichare clipped on the rail.

As can be seen from the cross-sectional views of FIGS. 4A, 4C, 4D and4E, the portion of the rail intermediate the lateral flanges are curvedconcavely. The curvature of the concaved portion substantially followsthat of the corresponding portion on the attachment member. As is shownin the Figures, the curvature on the upper side of the attachment membersubstantially follows the curvature of the outer periphery of thecircular disc pocket described below. Hence, the upper side of theattachment member provides a more robust support to a medium disc. Inaddition, the rail is designed so that a plurality of disc holders canbe clipped on the filing rail at the same time and supported by thefiling rail, as more particularly shown in FIGS. 2 and 7.

Referring more particularly to FIGS. 1, 3 and 4A, the disc holder 30comprises a disc receptacle 31 and an attachment member 32. Theattachment member comprises a first side 33 for attaching to the discreceptacle and a second side 34 for detachably attaching to the rail. Anattachment clip is formed on the second side of the attachment memberfor clipping on to the filing rail. The disc receptacle comprises aflexible disc pocket adapted for accommodating a medium disc. As can beseen more clearly in FIG. 4C, the plane of the disc pocket issubstantially orthogonal to the longitudinal axis of the rail when thedisc pocket is supported on the rail with the attachment clip clamped onthe rail under normal use conditions.

The attachment member comprises first 35 and second 36 moulded pieceswhich are connected together, for example, by plastic riveting orbolting. The disc pocket is sandwiched between the two moulded pieces onthe first side of the attachment member. The first side of theattachment member comprises an arcuate portion which generally followsthe curvature of the optical disc to be held. The radial width of thearcuate portion is adapted so that there is adequate overlapping betweenthe disc and the moulded pieces for a sufficient and reliable securing.

As can be seen from the Figures, the arcuate portion of the first sideof the attachment member extends circumferentially along the directionsso that it overlaps with a minor portion of the outer circumference ofthe disc pocket. The free end of the first side of the arcuate portionof the attachment member has a curvature which follows the curvature ofthe outer parameter of the optical disc to be held so that the rim ofthe edge can rest and be supported by the attachment member when placedinside the disc pocket uprightly.

As can be more clearly seen in FIGS. 1 to 4E, the second side of theattachment member comprises the attachment clip which juxtaposes theclipping aperture 37 for clipping on to the rail. The clipping apertureis defined by a pair of opposing catches 38, 39 which are disposed atthe transversal ends of the clipping aperture. The clipping aperture,and therefore the opposing catches, is adapted to enable snap clippingof the disc holder onto the rail while the attachment clip is adaptedfor loosely clamping the clip on to the rail so that a clipped discholder can be slidable along the rail and change its position along therail. Each of the catches includes a curved hook which extends away fromthe main body and away from the first side of the attachment member. Thecurved hooks of the pair of catches curve towards each other to form aclipping aperture with a narrowed entry aperture. The portion of thecurved hook intermediate the free end and the main body of theattachment member comprises a concavely curved indentation 40. The pairof concaved indentations and the second side of the attachment membertogether form an enlarged clipping aperture with rounded lateral ends.

The combination of the narrowed entry aperture formed by the curved freeends of the hooks and the enlarged clipping aperture formed by theconcaved portions of the hooks and the convex free side of the secondside of the attachment member together form an attachment clip with aclipping aperture. With such an aperture, the first and the secondflanges of the rail member are confined between the rounded ends of theclipping aperture. Since the separation between the free ends of thehooks are designed to be smaller than the lateral extent of the firstand second flanges, the flanges will be tracked within the rounded endclipping aperture. The width of the aperture is comparable to thenon-data camping portion of a medium disc to provide stable support.

In another perspective, the pair of catches can be visualised as a pairof oppositely facing teeth which protrude away from the attachmentmember. The free ends of the pair of oppositely facing teeth define theentry aperture and the portions of the teeth between the free ends andthe attachment member define the latching aperture. Since each of theflanges has a rounded outer edge and each of protruding teeth comprisesan arcuate indentation intermediate its free end and the attachmentmember and facing the other opposite tooth, the corresponding arcuateportions of the pair of protruding teeth together forms a latchingaperture with arcuate transversal ends.

The main body of the attachment member, comprising the first and secondmoulded pieces, is moulded from hard or durable plastics with a degreeof elastic resilience, for example, PVC, PP and PC, so that the freeends of the hooks will be slightly and resiliently forced apart onnegotiating with the first and the second flanges during attachment ordetachment.

The disc pocket is adapted for providing a storage space for a mediumdisc. The storage compartment of the disc pocket comprises a backingmember and a front member. The backing member 41 is a flexible opaquesheet and the front 42 member is flexible and transparent so that thelabel on one side of the medium disc can be seen. Both the backingmember and the front member are usually made from soft plastics so thatthe disc pocket is reasonably thin and flexible.

In the present example, both the opaque backing member and thetransparent front member are circular and stitched along a portion oftheir outer circumference, leaving a disc transit aperture 43 for mediumdisc transit at the upper half of the storage compartment, so that amedium disc can be inserted or removed into the disc storage compartmentthrough the upper aperture of the storage compartment. To facilitateeasy transit, the width of the disc transit aperture is comparable andslightly larger than the diameter of the medium disc to be held in thestorage compartment and a radially extending aperture 44 is formed onthe transparent front member between the 12 o'clock position and thecentre of the transparent window for finger access during removal of themedium disc from the disc pocket. To provide a comfortable storagecompartment, the back and front members are stitched at the lowercircumferential portion of the disc pocket so that a substantiallysemi-circular stitched boundary is formed to restrain a disc duringnormal storage and use.

When a disc holder has been clipped onto the rail member and used undernormal conditions, the disc holder is supported on the rail andmaintained in a substantially upright configuration with the disctransit aperture at the top, as shown in FIGS. 1, 4C and 5. The hookmembers which define the clipping aperture are configured so that theattachment clip will clamp loosely on the rail and is slidable along therail. As can be seen in FIG. 4E, the free end of the hook will engagewith the underside of the flanges, with the rounded portion of the hooksslightly spaced apart from the flanges so as to allow sliding movementof the attachment clip along the rail. Because of the small space or gapmaintained between the lateral sides of the flanges and the attachmentclip, the disc holder, while in the clipped configuration, is swingableaway from the vertical plane or the plane which is orthogonal to thelongitudinal axis of the rail for a pre-determined extent depending onthe shape and curvature of the curved hooks so that the contents on oneside of a medium disc can be read at an elevation as shown in FIG. 2.

The operation of the medium disc filing means will be explained infurther detail below.

Referring to FIGS. 3 to 4C, a disc holder is to be attached onto therail. The disc holder is moved towards the rail with the disc transitaperture at the top and the clipping aperture moving towards the rail.On approaching the rail, as shown in FIG. 4A, the attachment member isslightly tilted with respect to the vertical longitudinal plane of therail so that one of the hook members can catch and engage with theflange, as shown in FIGS. 4D and 4E. After the first hook member hasengaged with one of the flanges, as shown in FIGS. 4B and 4E, the otherhook member will be pushed downwards to the other flange to makecomplete engagement. As the hook members are slightly elastic resilient,it will be slightly deformed on being pushed downwards towards theflange but will restore to its pre-deformed catching configuration afterpassing through the flange and having engaged with the underside of theflange, as shown in FIG. 4C. When the disc holder is to be removed fromthe rail, one side of the attachment member is lifted away from theflange, as shown, for example, in FIGS. 4B and 4E, until the hook memberis cleared of the flange. Once a hook member has been disengaged, theother hook can be easily disengaged.

FIGS. 5 to 13 illustrate an exemplary embodiment of a disc storagecontainer 50 comprising a disc filing means of the present invention. Ascan be seen from FIGS. 5-8, the disc storage container comprises anenclosure 51 which surrounds the medium disc filing means comprising aplurality of disc holders being held on a rail. The enclosure comprisesa flexible cylindrical body with a sliding fastener, for example, a zip,distributed longitudinally at the half cross-section so that theenclosure body can be split into two substantially equal semi-circularprismatic enclosures. It will be appreciated that the overall dimensionsof the disc storage container are comparable to the overall dimensionsof the totality of the discs which can be stored inside the enclosureand gives a very good storage space efficiency.

As can be seen from FIGS. 7 and 8, a plurality of disc holders, whichcan be filled with medium discs or empty, are clamped between the twostopping plates and are maintained in a substantially uprightconfiguration since the disc holders are closed packed between thestopping plates. It will be appreciated that under such circumstances,the disc holders do not have sufficient space to swing or incline withrespect to the vertical plane which is substantially orthogonal to thelongitudinal axis of the rail. As the disc holders are clipped on therail, the disc container can be carried around or transported with thedisc holders maintained in the same order relative to the rail and eachother.

If a disc holder or a disc is to be removed from the filing means, itcan be selectively removed by disengaging the clipped member from therail in the manner described above. If a disc holder is to be replaced,it can be inserted at selected or randomly selected positions, and, ifthe user wants to re-arrange the sequence of the disc, the disc holderadjacent to a randomly selected position can be pushed aside to allow aspace for insertion. Hence, it will be appreciated that a disc can beremoved from the rail and inserted to the disc filing system at randomselected positions at the will of a user.

While the present invention has been explained by reference to theexamples or preferred embodiments described above, it will beappreciated that those are examples to assist understanding of thepresent invention and are not meant to be restrictive. The scope of thisinvention should be determined and/or inferred from the preferredembodiments described above and with reference to the Figures whereappropriate or when the context requires. In particular, variations ormodifications which are obvious or trivial to persons skilled in theart, as well as improvements made thereon, should be considered asfalling within the scope and boundary of the present invention.

Furthermore, while the present invention has been explained by referenceto a flexible enclosure, it should be appreciated that the invention canapply, whether with or without modification, to other enclosures,including rigid plastic housings, without loss of generality.

1. A medium disc filing means comprises a filing rail and a plurality ofdetachable disc holders, the filing rail comprises a rail body and apair of transversally protruding flanges, each disc holder comprises anattachment member and a medium disc receptacle, the disc receptacle isattached to one side of the attachment member, the other side of theattachment member which is not attached to the disc receptacle comprisesa clipping aperture for detachably attaching the disc holder to thefiling rail, the clipping aperture is resiliently deformable so that itcan be deformed to overcome the transversal width of the pair of flangesso that the disc holder can be attached to or detached from the filingrail.
 2. A medium disc filing means according to claim 1, wherein theclipping aperture comprises an entry aperture and a latching aperture,the latching aperture is intermediate the entry aperture and the discpocket and is in communication with the entry aperture, the entryaperture is narrower than the transversal width of the filing rail, thelatching aperture is wider than the entry aperture and is adapted forbracketing the transversal ends of the filing rail.
 3. A medium discfiling means according to claim 1, wherein the clipping aperturecomprises a pair of oppositely facing teeth which protrude away from theattachment member, the free ends of the pair of oppositely facing teethdefine the entry aperture and the portions of the teeth between the freeends and the attachment member defines the latching aperture.
 4. Amedium disc filing means according to claim 2, wherein each of theflanges has a rounded outer edge and each of protruding teeth comprisesan arcuate indentation intermediate its free end and the attachmentmember and facing the other opposite tooth, the corresponding arcuateportions of the pair of protruding teeth together forms a latchingaperture with arcuate transversal ends.
 5. A medium disc filing meansaccording to claim 2, wherein the attachment member is made of durableplastics and the teeth are integrally moulded thereon.
 6. A medium discfiling means according to claim 2, wherein the medium disc receptaclecomprises an aperture through which a medium disc is inserted orremoved, the aperture being opposite the filing rail.
 7. A medium discfiling means according to claim 1, wherein the medium disc receptaclecomprises a disc pocket with a substantially circular profile anddimensioned to receive a medium disc to be placed inside the discpocket, the attachment member comprises an attachment clip which isattached to a minor outer circumferential portion of the pocket.
 8. Amedium disc filing means according to claim 6, wherein the side of theattachment clip which is attached to the disc pocket comprises anarcuate rim portion, the arcuate rim portion is shaped and dimensionedto support a circumferential portion of a medium disc when the mediumdisc is inserted inside the disc pocket during normal use so that saiddisc rests on said attachment member.
 9. A medium disc filing meansaccording to claim 7, wherein the disc pocket is flexible and comprisesa transparent window with a opaque back-sheet, a radially extendingaperture is provided on the transparent window to allow finger access toa medium disc being formed on the transparent window to facilitateremoval of a medium disc from said pocket.
 10. A medium disc filingmeans according to claim 2, wherein the filing rail comprises a concaveportion which is intermediate the pair of flanges, the side of theattachment member which is adapted for clipping on to the filing railcomprises a convex portion which is shaped to correspond to thecurvature of the concave portion of the filing rail.
 11. A medium discfiling means according to claim 1, wherein the attachment clip comprisesa clipping aperture with a pair of opposing catches defining theclipping aperture between them, the catches are disposed at thetransversal ends of the clipping aperture and are adapted for clippingon the flanges of the filing rail transversally in a snap-on manner. 12.A medium disc filing means according to claim 10, wherein each of theopposing catches comprises a curved hook, the curved hooks of theopposing catches curve towards each other to form the clipping aperture.13. A medium disc filing means according to claim 12, wherein eachflange has a rounded outer edge, the curvature of each curved hook ofsaid catch substantially follows the curvature of the rounded outer edgeof the flange.
 14. A medium disc filing means according to claim 10,wherein the medium disc receptacle comprises a disc pocket with asubstantially circular profile and dimensioned to received a medium discto be placed inside the disc pocket, the attachment member comprises amain body with an arcuate profile and with the opposing catchesprotruding from the main body to form the clipping aperture, the mainbody comprises two moulded plastic pieces which are fastened together ina back-to-back manner with a minor circumferential portion of the discpocket sandwiched between the moulded plastic pieces to hold the discpocket.
 15. A medium disc filing means according to claim 13, whereinthe opposing catches are integrally moulded on one of the mouldedpieces, the spacing between the catches is adapted to allow theattachment member to slide along the rail when the disc holder has beenattached on the rail.
 16. A medium disc filing means according to claim13, wherein the disc pocket comprises an aperture which is adapted forinsertion or removal of a medium disc from the disc pocket, the aperturebeing diametrically opposite the attachment clip.
 17. A medium discfiling means according to claim 10, wherein the pair of opposing catchesbeing disposed so that the distance between the opposite approachingends is less than the width of the filing rail, the pair of opposingcatches being resiliently deformable and can be forced apart uponengaging and disengaging from the filing rail.
 18. A medium disc filingmeans according to claim 10, wherein the disc holder is detachablyclipped on the filing rail with the disc holder immediately above thefiling rail, the catch comprises a curved hook, the curvature of thehook substantially follows that of the flange and the pair of hooksclamp on the underside of the flanges, whereby the disc holder isslidable along the filing rail but is restrained from detaching from thefiling rail.
 19. A medium disc filing means according to claim 17,wherein the disc holder comprises a pair of back-to-back disc pocketseach having a transparent window and sharing a common opaque back sheet,the disc holder can swing between first and second inclination planesrelative to a transversal orthogonal plane of the filing rail so thatinformation appearing on medium discs stored in the disc pockets can beviewed, the extent of swinging of the disc holder being co-operativelydefined by the curved hooks and the flanges.
 20. A medium disc storagemeans comprising medium disc filing means of claim 1, the storage meansfurther comprising a re-closable enclosure surrounding the medium discfiling means.
 21. A medium disc storage means of claim 20, wherein there-closable enclosure comprises a flexible and generally cylindricalbody with a longitudinally extending zip.
 22. A medium disc storagemeans of claim 20, further comprising a flexible handle which extendslongitudinally.
 23. A medium disc holder adapted for attaching to afiling rail, comprising a disc pocket and an attachment, the attachmentclip comprises a pair of opposing catches defining a clipping aperturebetween them, the catches are disposed at the transversal ends of theclipping aperture and are adapted for snap-type clipping on the filingrail, the pair of opposite catches are adapted so that the disc holdercan slide along the filing rail, one side of the attachment member isattached to the disc pocket and the clipping aperture is formed on theother side, the clipping aperture is adapted so that the disc holder canslide along the filing rail so that its longitudinal clipping locationcan be changed by a user, wherein, the disc holder is adapted so that amedium disc is held above the filing rail during normal use.
 24. Amedium disc holder according to claim 23, wherein each of the opposingcatches comprises a curved hook, the curved hooks of the opposingcatches curving towards each other and are adapted to catch the filingrail between them.
 25. A medium disc holder according to claim 23,wherein the attachment member comprises a main body and the opposingcatches protrude from said main body to from said main body to form theclipping aperture, the main body being arcuate and comprising twomoulded pieces which are fastened together with a minor circumferentialportion of the disc pocket sandwiched between the moulded pieces to holdthe disc pocket.